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V-Lab

Polaris Group APARCH Volatility Analysis

Volatility prediction for Tuesday, July 21st, 2026

1 Day

48.45%

decreased by 1.91%

1 Week

49.33%

decreased by 1.03%

1 Month

51.82%

increased by 1.46%

Analysis last updated: Tuesday, July 21, 2026 at 07:56 PM UTC

Date Range:

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to

6M ·

1Y ·

2Y ·

5Y ·

10Y ·

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graph of Polaris Group APARCH

News Impact Curve

How returns affect tomorrow's volatility

Volatility Forecast

How volatility evolves over time

Parameter Estimates

Feb 15, 2016 to Jul 17, 2026

Model Insight

This asset shows a rare inverse leverage effect: positive returns raise next-day volatility 32% more than negative returns. Volatility rises more after gains than after losses, the reverse of the usual leverage effect and uncommon among risky assets. The volatility power δ = 2.19 sits above 2, so large shocks influence volatility more than quadratically, dominating the response more than in standard GARCH.

σ

APARCH Model

Tap to view equation

ParameterValuet-statistic
ω

const

Unconditional variance weight

0.7771
5.83***
α

ARCH

Response to squared shocks

0.0943
9.47***
β

GARCH

Volatility persistence

0.8514
81.64***
γ

leverage

Additional response to negative shocks

-0.0628
-2.04**
δ

power

Transformation power

2.1879
16.55***

Persistence:

0.953

Half-life:

14 days